From 8a61ff432543a29234193cd1f7c14abd3f3d31a0 Mon Sep 17 00:00:00 2001
From: Felix Mulder <felix.mulder@gmail.com>
Date: Wed, 2 Nov 2016 11:08:28 +0100
Subject: Move compiler and compiler tests to compiler dir

---
 .../tools/dotc/core/tasty/TastyUnpickler.scala     | 95 ++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 compiler/src/dotty/tools/dotc/core/tasty/TastyUnpickler.scala

(limited to 'compiler/src/dotty/tools/dotc/core/tasty/TastyUnpickler.scala')

diff --git a/compiler/src/dotty/tools/dotc/core/tasty/TastyUnpickler.scala b/compiler/src/dotty/tools/dotc/core/tasty/TastyUnpickler.scala
new file mode 100644
index 000000000..8a1f58acd
--- /dev/null
+++ b/compiler/src/dotty/tools/dotc/core/tasty/TastyUnpickler.scala
@@ -0,0 +1,95 @@
+package dotty.tools.dotc
+package core
+package tasty
+
+import scala.collection.mutable
+import TastyFormat._
+import Names.{Name, termName}
+import java.util.UUID
+
+object TastyUnpickler {
+  class UnpickleException(msg: String) extends Exception(msg)
+
+  abstract class SectionUnpickler[R](val name: String) {
+    def unpickle(reader: TastyReader, tastyName: TastyName.Table): R
+  }
+}
+
+import TastyUnpickler._
+
+class TastyUnpickler(reader: TastyReader) {
+  import reader._
+
+  def this(bytes: Array[Byte]) = this(new TastyReader(bytes))
+
+  private val sectionReader = new mutable.HashMap[String, TastyReader]
+  val tastyName = new TastyName.Table
+
+  def check(cond: Boolean, msg: => String) =
+    if (!cond) throw new UnpickleException(msg)
+
+  def readString(): String = {
+    val TastyName.Simple(name) = tastyName(readNameRef())
+    name.toString
+  }
+
+  def readName(): TastyName = {
+    import TastyName._
+    val tag = readByte()
+    val length = readNat()
+    val start = currentAddr
+    val end = start + length
+    val result = tag match {
+      case UTF8 =>
+        goto(end)
+        Simple(termName(bytes, start.index, length))
+      case QUALIFIED =>
+        Qualified(readNameRef(), readNameRef())
+      case SIGNED =>
+        val original = readNameRef()
+        val result = readNameRef()
+        val params = until(end)(readNameRef())
+        Signed(original, params, result)
+      case EXPANDED =>
+        Expanded(readNameRef(), readNameRef())
+      case OBJECTCLASS =>
+        ModuleClass(readNameRef())
+      case SUPERACCESSOR =>
+        SuperAccessor(readNameRef())
+      case DEFAULTGETTER =>
+        DefaultGetter(readNameRef(), readNat())
+      case SHADOWED =>
+        Shadowed(readNameRef())
+    }
+    assert(currentAddr == end, s"bad name $result $start $currentAddr $end")
+    result
+  }
+
+  private def readHeader(): UUID = {
+    for (i <- 0 until header.length)
+      check(readByte() == header(i), "not a TASTy file")
+    val major = readNat()
+    val minor = readNat()
+    check(major == MajorVersion && minor <= MinorVersion,
+      s"""TASTy signature has wrong version.
+         | expected: $MajorVersion.$MinorVersion
+         | found   : $major.$minor""".stripMargin)
+    new UUID(readUncompressedLong(), readUncompressedLong())
+  }
+
+  val uuid = readHeader()
+
+  locally {
+    until(readEnd()) { tastyName.add(readName()) }
+    while (!isAtEnd) {
+      val secName = readString()
+      val secEnd = readEnd()
+      sectionReader(secName) = new TastyReader(bytes, currentAddr.index, secEnd.index, currentAddr.index)
+      goto(secEnd)
+    }
+  }
+
+  def unpickle[R](sec: SectionUnpickler[R]): Option[R] =
+    for (reader <- sectionReader.get(sec.name)) yield
+      sec.unpickle(reader, tastyName)
+}
-- 
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